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The effect of additives on the properties of ZrO2 stabilized with calcia and magnesia

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Conclusions

The impurities TiO2, Al2O3, SiO2 and P2O5 impair the stabilization of zirconia: SiO2 and P2O5 to a great extent, and TiO2 and Al2O3 to a less extent when magnesium stabilizer is used, and only quite mildly when CaO is used as the stabilizer. However, after prolonged heat treatment, TiO2 and Al2O3 give rise to decomposition of certain parts of the solid solutions in the ZrO2 stabilized with calcium, while with the remaining impurities this is not observed.

The impurities TiO2 and Al2O3 aid sintering of the material and SiO2 and P2O5 give rise to embrittlement.

The impurities investigated in most cases impair the thermomechanical properties of the sintered ZrO. The softening temperature under load is reduced with all impurities and is especially marked for bodies containing SiO2.

The limiting service temperatures for zirconia refractories can be greatly increased by using pure raw materials.

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Authors and Affiliations

  1. The D. I. Mendeleev Institute of Chemical Technology, Moscow

    G. P. Kalliga & L. A. Lyutsareva

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  1. G. P. Kalliga
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  2. L. A. Lyutsareva
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Kalliga, G.P., Lyutsareva, L.A. The effect of additives on the properties of ZrO2 stabilized with calcia and magnesia. Refractories 5, 437–442 (1964). https://doi.org/10.1007/BF01285831

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